Keep in mind, though, Echo Mirage was a long, long, time ago. What skills did he use to get rich, since then? Murderfacing people like a common thug, or business acumen, and riding the cutting edge of certain technological markets?
And, seriously, it doesn't matter where his skills lie -- anyone with the money should have a top of the line commlink, especially since War! came out and raised the bar by introducing all the level 10 stuff. There's no reason for someone with Knight's cash to not have a ridiculously secure 'link, same as Nadia, Villiers, or Lanier. If anyone's commlink in SL:Supplemental is out of place to me, it's a long-time corporate troubleshooter like Ravenheart, and her Erika Elite full of 3s and 4s.